You are sitting in one of the largest metro areas in the USA. There are literally thousands of available small block chevy engines within a few hours drive of you!! There are rebuilder's supply yards several places in the MetroPlex, look in the Yellow Pages. Go to an engine rebuilder and ask where you can buy an assembly. Go to your local automotive machine shop and ask. Go to your local speed shop and ask and put a "wanted" sign on their bulletin board.
Go to your local Chevy dealer and ask in the parts department and the service department...we just bought a complete LS1 long block for $100 (slightly broken). Find a smaller garage shop and ask. Find the junkyard row in Fort Worth and up near Sachse......do some leg work instead of asking others to do it for you!!!!